<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图书商城</title>
    <style>
        a{
            text-align: center;
        }
    </style>
</head>
<body>
<div><a href="{% url 'books' %}"><h1>图书商城后台系统</h1></a></div>
</body>
</html>